Can I use same subnet across the wan ???

Unanswered Question
Jan 4th, 2008

I have one scenerio like I have two sites, one site is using IP address from to 100 with mask 24 and another site is using same subnet IP address from 192.168.101 to 200 with mask 24. And objective is to start to communication without NATing.

I have this problem too.
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s.arunkumar Fri, 01/04/2008 - 02:14

I think it is better to subnet into two subnets and use in each site.

ie, in one and in another...and put a static route to one another from each router..

Jon Marshall Fri, 01/04/2008 - 02:29


There are a number of alternatives.

1) Break into 2 subnets as Arun suggested.

2) Use NAT, but i understand you do not want to do this.

3) Use L2TPv3 which will allow you to extend your layer 2 vlan across an IP routed network - see attached link for details.

4) If your WAN was MPLS you could run VPLS and extend your vlan that way but it doesn't look from your diagram as though this is an MPLS network.



amitdash Fri, 01/04/2008 - 02:58


Option 3 is good solution for my scenerio.

Thanks a lot


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